org.omegahat.Environment.Databases
Class LazyFunctionDatabase

java.lang.Object
  |
  +--org.omegahat.Environment.Databases.ObjectDatabase
        |
        +--org.omegahat.Environment.Databases.ReadWriteDatabase
              |
              +--org.omegahat.Environment.Databases.TypedDatabase
                    |
                    +--org.omegahat.Environment.Databases.LazyFunctionDatabase

All Implemented Interfaces:

Activable, Database, DatabaseNotifier, DynamicFieldAccessInt, MergableInt, Named, ReadWriteDatabaseInt, java.io.Serializable, Subsettable, TypedDatabaseInt

public class LazyFunctionDatabase

extends TypedDatabase

Database used to implement lazy arguments keeping the appropriate entires as unevaluated expressions and evaluating them when they are first accessed, caching the resulting values for future access.

See Also:

Serialized Form

Field Summary

static boolean	DefaultStripFlag
protected Evaluator	evaluator
protected LazyFunction	function
static java.lang.String	LazyArgument

Fields inherited from class org.omegahat.Environment.Databases.TypedDatabase

typeTable

Fields inherited from class org.omegahat.Environment.Databases.ReadWriteDatabase

permissions

Fields inherited from class org.omegahat.Environment.Databases.ObjectDatabase

listeners, name, state, table, user

Fields inherited from interface org.omegahat.Environment.Databases.Database

ALL, ASSIGN, ATTACH, DETACH, NULL_ENTRY, READ, READ_WRITE, REMOVE

Fields inherited from interface org.omegahat.Environment.Databases.Activable

ACTIVE, INACTIVE

Constructor Summary

LazyFunctionDatabase()

LazyFunctionDatabase(LazyFunction function)

LazyFunctionDatabase(LazyFunction function, Evaluator evaluator)

LazyFunctionDatabase(java.lang.String name)

Method Summary

boolean	assign(java.lang.String name, java.lang.Object obj) assigns obj to the database under name.
Evaluator	evaluator()
Evaluator	evaluator(Evaluator eval)
LazyFunction	Function()
LazyFunction	Function(LazyFunction f)
java.lang.Object	get(java.lang.String name) returns the object in the database assigned under the name.
java.lang.Object	get(java.lang.String name, boolean evaluate)
java.lang.Object	get(java.lang.String name, boolean evaluate, boolean strip)
java.lang.Object	get(java.lang.String name, Evaluator evaluator)
boolean	isLazy(java.lang.String name)
Database	templateDB()

Methods inherited from class org.omegahat.Environment.Databases.TypedDatabase

checkType, remove, setType, setType, setType, setType, type

Methods inherited from class org.omegahat.Environment.Databases.ReadWriteDatabase

permissions, permissions, readOnly, readOnly

Methods inherited from class org.omegahat.Environment.Databases.ObjectDatabase

addAssignListener, addAttachListener, addDetachListener, addListener, addRemoveListener, assign, attach, clear, detach, exists, getDynamicField, getName, getState, getTable, merge, merge, notify, objects, put, readOnly, readOnly, readSerialized, readSerialized, readSerialized, remove, setDynamicField, setName, setState, setTable, size, subset, table, table

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.omegahat.Environment.Databases.Database

attach, clear, detach, exists, getName, objects, setName, size

Methods inherited from interface org.omegahat.Environment.Databases.Activable

getState, setState

Field Detail

DefaultStripFlag

public static boolean DefaultStripFlag

LazyArgument

public static java.lang.String LazyArgument

evaluator

protected Evaluator evaluator

function

protected LazyFunction function

Constructor Detail

LazyFunctionDatabase

public LazyFunctionDatabase()

LazyFunctionDatabase

public LazyFunctionDatabase(java.lang.String name)

LazyFunctionDatabase

public LazyFunctionDatabase(LazyFunction function)

LazyFunctionDatabase

public LazyFunctionDatabase(LazyFunction function,
                            Evaluator evaluator)

Method Detail

get

public java.lang.Object get(java.lang.String name,
                            Evaluator evaluator)

get

public java.lang.Object get(java.lang.String name)

Description copied from interface: Database

returns the object in the database assigned under the name. or null if none.

Overrides:

get in class ObjectDatabase

get

public java.lang.Object get(java.lang.String name,
                            boolean evaluate)
                     throws java.lang.Throwable

get

public java.lang.Object get(java.lang.String name,
                            boolean evaluate,
                            boolean strip)
                     throws java.lang.Throwable

assign

public boolean assign(java.lang.String name,
                      java.lang.Object obj)
               throws java.lang.Exception

Description copied from interface: Database

assigns obj to the database under name.

Overrides:

assign in class TypedDatabase

Following copied from interface: org.omegahat.Environment.Databases.Database

Parameters:

obj - any object, including null

name - a string (preferably non-empty) to locate the object in the database.

evaluator

public Evaluator evaluator()

evaluator

public Evaluator evaluator(Evaluator eval)

templateDB

public Database templateDB()

Function

public LazyFunction Function()

Function

public LazyFunction Function(LazyFunction f)

isLazy

public boolean isLazy(java.lang.String name)